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C 20
C20 or C-20 may refer to: Science and technology * Carbon-20 (C-20 or 20C), an isotope of carbon * C20, the smallest possible fullerene (a carbon molecule) * C20 (engineering), a mix of concrete that has a compressive strength of 20 newtons per square millimeter * Malignant neoplasm of rectum, a type of colorectal cancer (ICD-10 code: C20) * Caldwell 20 or North America Nebula, an emission nebula in the constellation Cygnus * IEC 60320 C20, a polarised, three pole socket electrical connector * C20 (Capacity, 20 hours), C100 (100 hours), battery capacity Transportation and military * Colt Canada C20 DMR, a Canadian designated marksman rifle * , a 1910 British C-class submarine * Sauber C20, a 2001 racing car * SL C20, a type of rolling stock used in the Stockholm metro * , a cruiser of the Royal Navy * C-20, the proposed in-service designation of the Fokker F-32 * C-20A/B/C/D/E, variants of the Gulfstream III * C-20F/G/H/J, variants of the Gulfstream IV * C20 is a version of the Alli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Carbon-20
Carbon (6C) has 14 known isotopes, from to as well as , of which only and are stable nuclide, stable. The longest-lived radionuclide, radioisotope is , with a half-life of years. This is also the only carbon radioisotope found in nature, as trace quantities are formed cosmogenic nuclide, cosmogenically by the reaction + → + . The most stable artificial radioisotope is , which has a half-life of . All other radioisotopes have half-lives under 20 seconds, most less than 200 milliseconds. The least stable isotope is , with a half-life of . Light isotopes tend to decay into isotopes of boron and heavy ones tend to decay into isotopes of nitrogen. List of isotopes , -id=Carbon-8 , , style="text-align:right" , 6 , style="text-align:right" , 2 , , [] , proton emission, 2p , Also immediately emits two protons for the net reaction of → + 4 , 0+ , , , -id=Carbon-9 , rowspan=3, , rowspan=3 style="text-align:right" , 6 , rowspan=3 style="text-align ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Fokker F-32
The Fokker F-32 was a passenger aircraft built by the Fokker Aircraft Corporation of America in 1929 in their Teterboro, New Jersey factory. It was the first four-engined aircraft designed and built in the United States. Ten examples were built, but they only entered limited commercial service; their high cost and problems with the cooling of the aft engines proved prohibitive. The United States Army Air Corps evaluated the F-32 as the YC-20, but did not purchase it. Crash The first F-32 crashed on November 27, 1929, during a demonstration of a three-engined takeoff from Roosevelt Field on Long Island, New York. One of the two port engines was stopped, but the other failed shortly after takeoff, causing a loss of control. The aircraft came down on a house in nearby Carle Place, and was totally destroyed in the crash and subsequent fire. Nobody was killed, although the pilot and a passenger were injured. This crash was witnessed by famous American poet Ogden Nash, who wro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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King's Pawn Game
The King's Pawn Game is any chess opening starting with the move: : 1. b:Chess Opening Theory/1. e4, e4 It is the most popular opening move in chess, followed by 1.d4, the Queen's Pawn Game. Principles White opens with the most popular of the twenty possible opening moves. Since nearly all openings beginning 1.e4 have names of their own, the term ''King's Pawn Game,'' unlike Queen's Pawn Game, is rarely used to describe the opening of the game. Advancing the king's pawn two squares is highly useful because it occupies a square, attacks the center square d5, and allows the of White's and queen (chess), queen. Bobby Fischer said that the King's Pawn Game is "Best by test", and proclaimed that "With 1.e4! I win." Opening categorization and continuations King's Pawn Games are further classified by whether Black responds with b:Chess Opening Theory/1. e4/1...e5, 1...e5 or not. Openings beginning with b:Chess Opening Theory/1. e4, 1.e4 b:Chess Opening Theory/1. e4/1...e5, e5 are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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OMX Copenhagen 20
The OMX Copenhagen 25 (), formerly KFX and OMXC20) is the top-tier stock market index for Nasdaq Copenhagen, which is part of the Nasdaq Nordic, prior being replaced (as of December 2017) was known as OMX Copenhagen 20 index. It is a market value weighted index that consists of the 25 most-traded stock classes. Components The following 25 listings make up the index as of April 2025. Annual returns The table shows the annual development of the OMX Copenhagen 25 calculated back to 1922. Footnotes External links Bloomberg page for KFX:IND {{OMX Copenhagen 20 companies European stock ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Bill C-20
Bill C-20 refers to various legislation introduced into the House of Commons of Canada, including: * '' Clarity Act'', relating to the secession of a province, introduced in 1999 to the second session of the 36th Parliament * ''An Act to amend the Criminal Code (protection of children and other vulnerable persons) and the Canada Evidence Act ''An Act to amend the Criminal Code (Protection of Children and Other Vulnerable Persons) and the Canada Evidence Act'' () is an act of the Parliament of Canada passed in 2005. The Act amended several statutes related to the consent of sexual ac ...'', introduced in 2002 to the second session of the 37th Canadian Parliament; not passed but subsequently re-introduced * ''Fair Representation Act'', concerning redistribution, introduced in 2011 to the first session of the 41st Parliament {{SIA Canadian federal legislation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Allison Model 250
The Allison Model 250, now known as the Rolls-Royce M250, (US military designations T63 and T703) is a highly successful turboshaft engine family, originally developed by the Allison Engine Company in the early 1960s. The Model 250 has been produced by Rolls-Royce since it acquired Allison in 1995. Development In 1958, the Detroit Diesel Allison division of General Motors was chosen by the US Army to develop a new light turbine engine to power a "Light Observation Aircraft" (LOA), to replace the Cessna O-1A Bird Dog. At this stage the US Army was unsure whether to have a fixed- or rotary-wing aircraft, so Allison was instructed to consider both applications. Design studies undertaken considered a wide range of possible mechanical configurations for the turboprop/turboshaft. These studies culminated in the testing of the first prototype engine, designated YT63-A-3, in April 1959. In 1960, the US Army settled for a rotary wing platform. The YT63-A-3 first flew in a variant of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Gulfstream IV
The Gulfstream IV (or G-IV or GIV) and derivatives are a family of twinjet aircraft, mainly for private or Business jet, business use. They were designed and built by Gulfstream Aerospace, a General Dynamics company based in Savannah, Georgia, United States, from 1985 until 2018. Aircraft power is provided by two Rolls-Royce RB.183 Tay turbofans. Upon delivery of the last G450, over 900 GIV/GIV-SP/G450 units had been produced. The last of the G450s was delivered on 19 January 2018 after 365 deliveries over 12 years, ending a 30-year production run, to be replaced by the Gulfstream G500, G500. Development Gulfstream, in collaboration with Grumman, began work on the Gulfstream IV in March 1983 as a re-engined, stretched fuselage derivative of the Gulfstream III. The first GIV made its maiden flight on September 19, 1985. The model received type certification from the FAA on April 22, 1987. The G-IV entered into service with serial number 1000 in 1987 and was upgraded to the sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Gulfstream III
The Gulfstream III, a business jet produced by Gulfstream Aerospace, is an improved development of the Grumman Gulfstream II. The U.S. military uses versions of the Gulfstream III as the C-20A/B/C/D/E aircraft, though later C-20 F/G/H/J are Gulfstream IV. Design and development The Gulfstream III was built at Savannah, Georgia, in the United States and was designed as an improved variant of the Grumman Gulfstream II. Design studies were performed by Grumman Aerospace Corporation in collaboration with Gulfstream American Corporation. Design of the Gulfstream III started with an effort to synthesize a completely new wing employing NASA supercritical airfoil sections and winglets. Optimization studies considering weight, drag, fuel volume, cost, and performance indicated that a substantial portion of the new wing benefit could be secured with modifications to the existing wing. As a result, the new wing concept was canceled and work began on design modifications that would retai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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SL C20
The SL C20 is a type of subway train used in the Stockholm metro, Sweden. Between 1997 and 2004, 271 3-car sets, numbered 2000–2270, were delivered to Stockholm by the former Kalmar Verkstad, owned by Adtranz, later acquired by Bombardier Transportation. The C20 is a completely new design and therefore is not compatible with other train types in the system. At , each carriage is longer than the previous train types. To save cost and weight, each unit has only four bogies. The middle car has two bogies. The end parts consist of one bogie each and are connected to the central portion via a semi-trailer-direction. Trolley subframes are made of stainless steel, and are less susceptible to corrosion. The first new rolling stock type for the Stockholm metro since the C14 and C15 stock from the mid-1980s, the C20 was at launch advertised as the ''Vagn 2000'' () and marketed as the subway car of the future, though the only customer outside of Stockholm would be the Bucharest Metr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Fullerene
A fullerene is an allotropes of carbon, allotrope of carbon whose molecules consist of carbon atoms connected by single and double bonds so as to form a closed or partially closed mesh, with fused rings of five to six atoms. The molecules may have hollow sphere- and ellipsoid-like forms, cylinder (geometry), tubes, or other shapes. Fullerenes with a closed mesh topology are informally denoted by their empirical formula C''n'', often written C''n'', where ''n'' is the number of carbon atoms. However, for some values of ''n'' there may be more than one isomer. The family is named after buckminsterfullerene (C60), the most famous member, which in turn is named after Buckminster Fuller. The closed fullerenes, especially C60, are also informally called buckyballs for their resemblance to the standard ball (association football), ball of association football. Nested closed fullerenes have been named bucky onions. Cylindrical fullerenes are also called carbon nanotubes or buckytubes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Sauber C20
The Sauber C20 was the car with which the Sauber team competed in the 2001 Formula One World Championship. It was powered by a Petronas-branded '01A' 3.0-litre V10, supplied by Scuderia Ferrari. The C20 was notable not only for its eventual position in the Constructors' World Championship but also for a new type of front suspension mounting: the " twin keel". The twin keel The effect of airflow underneath the nose had first become apparent in the early 1990s. By the end of the decade, most teams had settled for a design where both lower front suspension arms were mounted from a single longitudinal "keel" running underneath the nose. For 2001, the FIA introduced a regulation lifting the sides of the front wing by 50mm, in order to reduce downforce and cut cornering speeds. Sauber had introduced separate pylons for each of the front suspension mounts on their previous car, the C19. For the C20, the area between the front and back mounting points on each side was filled in, creat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Colt Canada C20 DMR
The Colt Canada C20 DMR is a 7.62×51mm NATO designated marksman rifle created by Colt Canada, in response to a request by the Canadian Armed Forces to replace their earlier 5.56mm C8 carbine in sniper sections. The weapon is intended to enter service in the Canadian and Danish militaries, beginning in 2021. C20 rifles are fitted with the Schmidt & Bender 3-20×50 Ultra Short riflescope. Design The C20 DMR is a semi-automatic rifle that uses 20-round 7.62×51mm NATO box magazines. A major part of its design philosophy was making sure that it was reliable in extreme conditions, such as those specified in the NATO D/14 standards for safety, in which aspects of the weapon such as the kinematics, safety features, recoil, and barrel strength are put under the most severe strain. During these tests, the C20 fired 8,000 rounds without any stoppages and achieved an accuracy of 0.66 MOA over 144 five round groups. The C20 DMR barrel features 4 groove rifling with a 1:254 mm (1 in 10 i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |